Min/Max Ps; Ramp - ResMed VPAP ST-A User Manual

Min/Max PS

The default settings for maximum and minimum pressure support are normally adequate, but you may
wish to alter them in some patients.
Min PS and Max PS define the range of pressure support adjustment available to the iVAPS algorithm as
it regulates alveolar ventilation.
It is recommended that Max PS be set high enough to allow the alveolar ventilation target to be met,
while exercising clinical judgement over considerations such as patient comfort and tolerance, lung
mechanics, age, mask seal, etc.
It is recommended that Min PS is left at the level set when learning the patient's ventilation target
(default 4 cm H
O) unless the patient finds this too little for comfort.
2

Ramp

Ramp is designed to make the beginning of treatment more comfortable.
In CPAP mode during ramp time, the pressure increases from a low pressure to the prescribed treatment
pressure.
In S, ST and T modes, ramp time defines the period during which the EPAP gradually increases from the
Start EPAP to the prescribed treatment pressure. Pressure support remains at set PS during ramp.
IPAP
EPAP
Start EPAP
0
In iVAPS mode, ramp time defines the period during which the EPAP gradually increases from the
Start EPAP to the Min EPAP. Pressure support remains at Min PS during ramp.
Min PS
Start EPAP
0
Ramp time
Ramp time
Time
Max PS
Min PS
EPAP
Time
9
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